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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        function fn(N =true){
            if(N){
            let arr = ['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f']
            let color = '#'
            for(let i=1;i<=6;i++){
               let a = Math.floor(Math.random()*16)
               color+=arr[a]
            }
            return color
        }
        else{
            let r = Math.floor(Math.random()*256)
            let b = Math.floor(Math.random()*256)
            let g = Math.floor(Math.random()*256)
            console.log(`rgb(${r},${b},${g})`)
        }
    }
    console.log(fn())
    // console.log(fn(false))
    </script>
</body>
</html>